Improvement in telegraph-relays



c+. ALLAN s. J. W. BROWN.

TELEGRAPH-RELAY. N0.178,580. Patented June13, 1875.

UNITED STATES PATENT OFFICE.

,GEORGE ALLAN AND JAMES WALLACE BROWN, OF LONDON, ENGLAND.

IMPROVEMENT IN TELEGRAPH-RELAVS.

Specification forming part of Letters Patent No. 178,580, dated June 13, 1876; application filed May 31, 1875.

To all whom it may concern Beit known that We, GEORGE ALLAN and JAMES WALLACE BROWN, of London, England, have invented an Improved Relay or Pecker, ot' which the t'ollowin g is a speciicat-ion:

The object ot' the said invention is to record dots and dashes transmitted through a submarine cable, or other difficult circuitit may be a land lineby closing and breaking loca-l circuit on any ot' the Well-known recorders, either chemical or otherwise, at a superior rate of speed.

As means for eiiectin g the above object We construct a relay or pecker to act with a compou-nd motion by giving the contact maker or armature and the receiver each a simple motion. Equilibrium-springs are preferably applied to the contact maker or armature.

By the above means a i'all or rise ot' potential in the actuating current will serve as eli'ectually to make or break circuit as if the current were reversed.

The View hereunto annexed is illustrative oi' our said invention.-

The receiver, or as We call it, the movable contact, is construetedof two platina or met-al bars, c a', insulated from each other by the piece b. and supported in bearings c. d d', contactdisks, preferably or" platina. The said disks are in electrical contact with the bars c af, respectively. The movable contact a c is free to move longitudinally in its bearings. e e are the local-circuit Wires, and f the contact-maker or armature, free to vibrate on the center g, and kept in equilibrium by the springs It. it' are the tension adjusting-screws j, the magnets for actuating the armature f; k, the line-Wire; l, the earth-Wire 5 m, the local Wire. The Wires e m are connected to the recording instrument in' any ordinary or convenient manner.

In practice when a current is transmitted through the line-wire to give a signal the armature f is moved over to make contact with one of the disks-say d. It' the armature is acted kupon by a greater force than is necessary to make contact it will canse the movablecontact a a to slide in its bearings until equilibrium is produced by the action ot' the springs lt. It, now, there is a diminution ot' potential in the current theequilibrium-springs cause a retrograde motion of the armature, and contact With d is at once broken. When the diminution of potential is sufficient, or the current is reversed, not only is contact With d broken, but the armature is carried over against the disk d', and the movable contact a a is caused to slide in the direction of mo tion ofthe armature.

Having now described our invention so that others Will be enabled to understand the same,

we claim- I l`. The combination, in a relay or pecker, of an armature or contact-maker, f, working on a fixed center, g, with a movable receiver or contact, a a b d d', working in bearings c, and operating substantially as and for the purpose set forth.

2. The arrangement and combination of the armature and movable contact with the equilibrium-springs h, substantially as and for the purpose set forth.

G. ALLAN. JAMES WALLACE BROWN.

Witnesses:

E. T. HUGHES, J. E. WRIGHT. 

